Yes, I agree nnsoccer, PaintNet is a quite good tool and free to use.You can easily choose your color from the "advanced" tab, and put in you website.Good Day!
http://www.w3schools.com/ is good place to learn how to build a website. All the information about website is there. Also http://php.net/ is good. Here is php tutorial : http://forums.xisto.com/no_longer_exists/